I'm not sure how much the 17 in. wheel package adds to the bill...but it has to be a lot...the BBS wheels alone will run you about $2500.. If you want 17 in. wheels, I would suggest aftermarket after you buy the car...you can get the Rota Subzero for only $550 a set..

the best suspension you are going to find for street (and track too) would probably be the M2 DMS 40mm coilovers. A whole lot more comfortable than any of the JDM coilovers or teins.
I believe they cost about the same as the (overpriced) STi suspension option.

I'm seriously considering ordering a rex but need to know the options before i plan mods 8)

I noticed some turbochargers for the WRX on Vivid Racing's site...and they seem pretty damn cheap (999?? 1799??)...has anyone had any experience with them? how much power increase from the stock turbo?

I believe the parts are the same. The STi may have a few more bushing upgrades, but the package as a whole is awesome. Every part that comes in the package is OEM on the STi. There may be a few parts left out, but it's a serious upgrade.

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I'm seriously considering ordering a rex but need to know the options before i plan mods 8)

You mean like factory options? Or aftermarket parts? Tell us the goals that you plan to achieve with the car and we can help.

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I noticed some turbochargers for the WRX on Vivid Racing's site...and they seem pretty damn cheap (999?? 1799??)...has anyone had any experience with them? how much power increase from the stock turbo?

See above. Which turbo in particular? I have a PE1820 on my car. It cost me $1550, but it flows about twice the air that the stocker can. It'll pump an efficient charge clear up to 24psi too. Some more specifics about what you want and we can help you out,